Add another uri test

This is taken from the css data url test in GTK.
It used to work.
diff --git a/glib/tests/uri.c b/glib/tests/uri.c
index 6927b89..db313c2 100644
--- a/glib/tests/uri.c
+++ b/glib/tests/uri.c
@@ -349,6 +349,7 @@
       { "%ra", NULL, NULL },
       { "%2r", NULL, NULL },
       { NULL, NULL, NULL },  /* actually a valid test, not a delimiter */
+      { "Timm B\344der", NULL, "Timm B\344der" }
     };
   gsize i;